Dehui gas pressure regulator
The ice blockage often occurs in the inlet pipe of the cell unit, the surge tank and the metering box, because the inlet part of the pipeline is on the ground and partly underground. There are two ways to solve the ice jam. One is to prevent the formation of ice blockage; the two is to solve it after physical and chemical means. The measures include setting up drainages, strengthening equipment management and applying eddy current non damage thawing technology.
Key words: natural gas pipeline; ice blockage; drainer; eddy current nondestructive thawing; reactant
1 technical characteristics of ice blocking at present
At present, all the major Gas Co in China have encountered the problem of local stop gas caused by the pipeline ice jam, and continue to explore the treatment methods, but there is no perfect and effective solution. There are several ways to solve this problem: increase the dew point of natural gas (the state requires a temperature of less than 5 of the permafrost), depressurization, heating, and antifreeze (such as methanol and glycol). The function of nine gas regulators and analysis of ice blockage
Analysis of 2 Ice plugging
Water and steam in natural gas can form crystalline hydrates with C2, C3 and C4 of gaseous state. Hydrates can reduce the flow profile of pipes, and even block pipes, valves, instruments and equipment, such as safety valves, voltage regulators, etc. When the temperature decreases, the natural gas is lower than its dew point to form hydrate. It is easy to freeze into ordinary ice and make Guan Xianbing block. The ice blockage often occurs in the inlet pipe of the cell unit, the surge tank and the metering box, because the inlet part of the pipeline is on the ground and partly underground. In winter, the temperature of the ground is higher than that of the ground, and the temperature on the ground is less than 0, so that ice plugs are formed at the surface. The function of nine gas regulators and analysis of ice blockage
In addition, the material of the valve well is mostly steel body, which is equivalent to the temperature on the ground. There may also be ice blockage in the pipeline between the valve well and the underground. In engineering, ice blockage is also easy to occur during the winter operation of the pipeline system due to incomplete construction in the rainy season, underground water supply or pipeline sweeping. Steam can also aggravate the chemical reaction between O2, H2S and SO2 and the metals of pipes, valves and gas appliances, causing metal corrosion. Especially when water vapor condenses and water film forms on the inner surface of pipes and fittings, corrosion is more serious.
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